Differences with world war 1 and world war 2 weapons?

in world war I the trench was used especially in defense and to launch attacks on the enemy. the weapons in world war I were somewhat primitive. weapons such as tanks, mines, gas, artillery, planes, and submarines were relatively new and the tactics to use them effectively were in their infacy.

in World War II however the above mentioned weapons were well developed and were far superior to the earlier models. Gone were the days of hiding in trenches and crossing no mans land just to be shot up by machine guns. Hitler developed the technique of blitzkreig or "lightening war" in which a coordinated attack by planes, tanks, and infantry swarmed the enemy and immobolized them.